Fix infinite mixing loop with dummy audio output

modules/misc/dummy/aout.c

@@ -57,13 +57,13 @@ int OpenAudio ( vlc_object_t * p_this )
      && var_InheritBool( p_this, "spdif" ) )
     {
         p_aout->output.output.i_format = VLC_CODEC_SPDIFL;
-        p_aout->output.i_nb_samples = A52_FRAME_NB;
         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
         p_aout->output.output.i_frame_length = A52_FRAME_NB;
     }
     else
         p_aout->output.output.i_format =
             HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_S16N;
+    p_aout->output.i_nb_samples = A52_FRAME_NB;
 
     /* Create the variable for the audio-device */
     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );

src/audio_output/mixer.c

@@ -98,6 +98,9 @@ static int MixBuffer( aout_instance_t * p_aout, float volume )
     aout_fifo_t *p_fifo = &p_input->fifo;
     mtime_t now = mdate();
     const unsigned samples = p_aout->output.i_nb_samples;
+    /* FIXME: Remove this silly constraint. Just pass buffers as they come to
+     * "smart" audio outputs. */
+    assert( samples > 0 );
 
     aout_lock_input_fifos( p_aout );
     aout_lock_output_fifo( p_aout );